This is Dr. DavidI am sorry you are having these symptoms.excessive anxiety can cause shortness of breath and head pains and fatigue and excessive stomach acid and burning.lack of exercise or obesity or sleep apnea or low thyroid hormone levels can cause fatigue.have you tried any stomach acid blockers like omeprazole or prilosec or nexium?have you had a colonoscopy or upper endoscopy to look into your stomach and colon?are you overweight? do you smoke?